Sling Calculator
Calculate your sling.
Enter lift parameters to calculate sling capacity requirements, then find matching products from our inventory.
Common Scenarios
Live Calculation
ASME B30.9
01
Tension per Sling Leg
T = W ÷ (N × sin θ × H)
— = — ÷ (— × — × —)
ASME B30.9-5.1.1
02
Angle Factor
AF = 1 ÷ sin θ
— = 1 ÷ —
ASME B30.9 Table 9-2
03
Min WLL per Sling
WLLmin = T
—
ASME B30.9-0.2
04
Design Factor
MBS = WLL × DF
— = — × —
ASME B30.9-0.2
Standards
- ASME B30.9 — Slings
- ASME B30.5 — Cranes
- OSHA 1926.251 — Rigging
- OSHA 1910.184 — Slings
Lift Parameters
01
02
03
60°
Height
Spread
Below 30° not permitted per ASME B30.9.
04
05
Configuration
Sling
Load
Angle
Results
—
Tension per Leg
—
Min WLL Required
—
Angle Factor
multiplier
—
Design Factor
break:WLL
—
Sling Length
per unit height
—
Horiz. Force
Angle Factors
| Angle | Factor | Capacity |
|---|---|---|
| 90° (vertical) | 1.000 | 100% |
| 75° | 1.035 | 96.6% |
| 60° | 1.155 | 86.6% |
| 45° | 1.414 | 70.7% |
| 30° | 2.000 | 50.0% |
Hitch Factors
| Hitch | Factor |
|---|---|
| Vertical | 1.0× |
| Choker | 0.75× |
| Basket | 2.0× |
Design Factors
| Sling Type | Ratio |
|---|---|
| Wire Rope | 5:1 |
| Alloy Chain | 4:1 |
| Synthetic Web | 5:1 |
| Synthetic Round | 5:1 |
Engineering Disclaimer
This calculator provides estimates based on ASME B30.9 sling capacity formulas for product selection purposes only. It does not constitute an engineered lift plan. Actual rigging configurations must account for load geometry, center of gravity, dynamic loading, environmental conditions, and equipment condition. All lifts should be planned and supervised by qualified rigging personnel per ASME B30.5 and applicable OSHA regulations (29 CFR 1926.251). Liftgear is not liable for the use or misuse of these calculations. When in doubt, contact our rigging specialists.
